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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefd2e67c53f2b12eb1260be68075d16e9939c8196f1d260eeb4ee632c1af474' 
  AND token = '+yPomM2M8nc0UarJMJ7z18x6RdBYqmyBr6l2T4O91fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}